Difference between revisions of "Part:BBa K404202"

Revision as of 12:50, 26 October 2010

ViralBrick-453-His-Tag
The His-tag motif, ready for insertion into the 453 loop

Usage and Biology

Protein tagging via histidine tags is a widely used method for protein purification: Multiple histidine residues (most commonly: Six) are fused to the end of the targeting protein.
The high binding affinity of histidine towards metal is being exploited for the purification of proteins via the so called “Immobilized Metal Ion Affinity Chromatography“(IMAC): Multiple histidine residues (most commonly: Six) are being fused to the end of the targeting protein. A cell extract containing the recombinant protein is then applied to a column containing immobilized Ni2+-ions. The His-tags complex the Ni2+-ions while other cellular proteins can be washed off the column. The purified proteins can then be eluted with imidazole, which displaces the histidine residues.(Smith, Furman, Ingolia, & Pidgeon, 1988), (Hoffmann & Roeder, 1991)
Since the aim behind engineering therapeutic AAV vectors is a safe administration to human patients, it is important to consider a convenient way of purifying the virus particles. Contamination by cellular proteins could cause toxic side effects or a strong immune response. Koerber et al. have first inserted a His-tag into a surface-exposed loop at amino acid position 587 in the Cap protein and successfully purified recombinant virsuses using IMAC (Koerber et al. 2007). For our Virus Construction Kit, we provide the His-tag motif in the ViralBrick standard, allowing for an easy insertion into the 453 and/or 587 loop .

Sequence and Features